Defensive publication

ABSTRACT

A PROCESS FOR THE PRODUCTION OF LAMINATES BY SEQUENTIALLY INJECTING TWO OR MORE SYNTHETIC RESINS INTO A MOULD IN WHICH A COMPOUND TO IMPROVE THE ADHESION BETWEEN THE SYNTHETIC RESINS IS ALSO INJECTED INTO THE MOULD. THE RESINS ARE MAINTAINED WITHIN THE MOULD FOR SUFFICIENT TIME FOR THEM TO SET AND FOR A BOND TO FORM BETWEEN THEM WITH THE AID OF THE ADHESION IMPROVING COMPOUND. THE PROCESS IS PARTICULARLY USEFUL FOR ARTICLES HAVING A CELLULAR CORE AND AN UNFOAMED SURFACE. THE ADHESION IMPROVING COMPOUND, WHICH MAY ITSELF BE A SYNTHETIC RESIN, MAY BE INJECTED INTO THE MOULD BETWEEN THE INJECTION OF THE SYNTHETIC RESINS SO THAT AN ADHESIVE LAYER IS FORMED BETWEEN THEM. ALSO, THE ADHESION IMPROVING COMPOUND MAY COMPRISE TWO COMPONENTS WHICH REACT WITH EACH OTHER IN WHICH CASE EACH COMPONENT IS INCORPORATED INTO ADJACENT LAYERS OF THE SYNTHETIC RESINS SO THAT THE COMPONENTS REACT ALONG THE LINE DEFINING THE JOINT BETWEEN THE SYNTHETIC RESINS TO FORM A BOND.

EFENSWE UBLTCA'HUN UNITED STATES PATENT OFFICE Published at the request 01 the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 O.G. 687. The abstracts 01": Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. 'lhe heading of each abstract indicates the number of pages of specification, including claims and shectsof drawings contained in the application as originally filed. The files of these applications are available to the public'for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not'been examined as to the merits of alleged invention. The Patent Office makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED DECEMBER H, 1971 893 O.G. L03

1893,91!) PRODUCTION OF LAMINATES David Fairclough Oxley, St. Albans, England, assignor to Imperial Chemical Industries Limited, London, England Filed Feb. 4, 1971, Ser. No. 112,819 Int. Cl. B2941 27/00; B29f 1/00 U.S. Cl. 264-45 No Drawing. 10 Pages Specification A process for the production of laminates by sequentially injecting two or more synthetic resins into a mould in which a compound to improve the adhesion between the synthetic resins is also injected into the mould. The resins are maintained within the mould for sufiicient time for them to set and for a bond to form between them with the aid of the adhesion improving compound. The process is particularly useful for articles having a cellular core and an unfoamed surface. The adhesion improving compound, which may itself be a synthetic resin, may be injected into the mould between the injection of the synthetic resins so that an adhesive layer is formed be tween them. Also, the adhesion improving compound may comprise two components which react with each other in which case each component is incorporated into adjacent layers of the synthetic resins so that the components react along the line defining the join between the synthetic resins to form a bond. 

